Mari spends time with Dr. Gilbert while he hypothesizes about the Earth's magnetism. Meanwhile, Waka and her brother search Mr. Hayase's lab for signs of Mari.
I went to Waka's house to 
bake a ball-shaped cake.
fui a la casa de Waka para cocinar
un pastel con forma de pelota.
fui à casa da Waka
assar um bolo em forma de bola.